Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes at Statutory Federal Tax Rate to Company's Actual Income Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation Of Provision Of Income Taxes [Line Items]
Total (benefit) provision	$ (2,293)	$ 5,684	$ (100,362)
Parent
Reconciliation Of Provision Of Income Taxes [Line Items]
Computed at federal statutory rate	122,362	(178,078)	51,173
State taxes, net of federal benefit	4,145	(886)	8,913
Non-deductible expenses	1,895	2,589	7,247
Stock-based compensation	1,467	7,611	7,172
Net effects of consolidating the non-controlling interests’ tax provisions	(34,614)	(13,901)	(37,047)
Bargain purchase gain	0	0	(42,944)
Impairment of non-deductible goodwill	0	0	71,885
Change in valuation allowance	(96,769)	188,599	(66,429)
Valuation allowance release	0	0	(100,288)
Other	(1,062)	(558)	(348)
Total (benefit) provision	$ (2,576)	$ 5,376	$ (100,666)